igneous
Granite with Biotite and Iron Staining
Felsic to intermediate intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale; displays pinkish-gray matrix with dark biotite mica flakes and rusty iron oxide staining. Luster is vitreous to dull.
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Physical properties
Hardness of 6-7 on Mohs scale; displays pinkish-gray matrix with dark biotite mica flakes and rusty iron oxide staining. Luster is vitreous to dull.
Formation & geological history
Formed through the slow cooling of magma beneath the Earth's surface over millions of years.
Uses & applications
Commonly used in construction, architectural facings, and aggregate materials.
Geological facts
Biotite crystals within the rock often weather to show characteristic bronze or brown tones.
Field identification & locations
Identify by interlocking quartz and feldspar crystals accompanied by dark mica flakes; widely distributed globally in continental shields.
